CN101060587A - Picture displaying method, picture displaying apparatus, and imaging apparatus - Google Patents
Picture displaying method, picture displaying apparatus, and imaging apparatus Download PDFInfo
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- CN101060587A CN101060587A CNA2007101035667A CN200710103566A CN101060587A CN 101060587 A CN101060587 A CN 101060587A CN A2007101035667 A CNA2007101035667 A CN A2007101035667A CN 200710103566 A CN200710103566 A CN 200710103566A CN 101060587 A CN101060587 A CN 101060587A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/46—Colour picture communication systems
- H04N1/56—Processing of colour picture signals
- H04N1/60—Colour correction or control
- H04N1/6083—Colour correction or control controlled by factors external to the apparatus
- H04N1/6086—Colour correction or control controlled by factors external to the apparatus by scene illuminant, i.e. conditions at the time of picture capture, e.g. flash, optical filter used, evening, cloud, daylight, artificial lighting, white point measurement, colour temperature
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/63—Control of cameras or camera modules by using electronic viewfinders
- H04N23/633—Control of cameras or camera modules by using electronic viewfinders for displaying additional information relating to control or operation of the camera
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/20—Circuitry for controlling amplitude response
- H04N5/202—Gamma control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
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- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Studio Devices (AREA)
- Facsimile Image Signal Circuits (AREA)
- Exposure Control For Cameras (AREA)
- Picture Signal Circuits (AREA)
- Image Processing (AREA)
- Controls And Circuits For Display Device (AREA)
Abstract
A picture displaying method is disclosed. In the picture displaying method, a first picture is displayed. A luminance distribution chart which represents a distribution of luminance levels of the first picture is displayed. A first luminance level and a second luminance level are selected on the luminance distribution chart. The second luminance level is higher than the first luminance level. Input and output characteristics defined by the first luminance level and the second luminance level are changed to correct a gradation of the first picture and obtain the second picture. The first picture changes to the second picture and the second picture is displayed.
Description
Technical field
The present invention relates to a kind of method for displaying image, image display device and imaging device.
Background technology
Chang Yong imaging device is equipped with LCD as the display part usually in recent years.The user can operate transcriber, comes showing on the LCD that image and removable media that he or she has taken write down the image of record and browse them.In addition, this transcriber can show the histogram that the brightness (luminance) of the object that the expression user attempts to take distributes with image on LCD.With reference to the histogram that is presented on the LCD, the user can suitably set exposure correction.Therefore, even the user is unfamiliar with the operation of imaging device, he or she also can take has the image that enriches GTG (gradation).
In addition, LCD is constructed to touch-screen, and as operation and importation.When the user pushes the key that is presented on the LCD, can be performed corresponding to the processing of this key.
At publication number is that (hereinafter referred to as patent documentation 1) has been described and can be shown the histogrammic imaging device of representing brightness degree to distribute in the Japanese patent application of Te Kaiping (HEI) 7-38801.
On the other hand, at Japanese Patent Application Publication 2002-33956, hereinafter referred to as described a kind of imaging device in the patent documentation 2, this imaging device has gamma (gamma) circuit that allows optionally established standards pattern and wide dynamic range mode and change the GTG transfer characteristics corresponding to these patterns.
Summary of the invention
When shot object under the low-light level environment, because the dynamic range of the image that is taken is not enough, so entire image may become dark and fuzzy.In the past, when on LCD, showing this image, can not change the dynamic range of image so that image becomes clear.With reference to aforesaid histogram, correctly setting exposure correction or the like, rather than change the dynamic range that is presented at the image on the LCD.In the imaging device of in patent documentation 2, describing,, therefore can not suitably change the GTG transfer characteristic corresponding to user's operation because the GTG transfer characteristic is fixed for each pattern.
Consider aforementioned part, be desirable to provide a kind of method for displaying image, a kind of image display device and a kind of imaging device, it allows to utilize intensity map easily to change the dynamic range of shown image, and this intensity map is represented Luminance Distribution and is presented on the display part.
According to one embodiment of present invention, provide a kind of method for displaying image.In this method for displaying image, show first image.The intensity map that shows the brightness degree distribution of expression first image.On intensity map, select first brightness degree and second brightness degree.Second brightness degree is higher than first brightness degree.The input-output characteristic that change is limited by first brightness degree and second brightness degree is with the GTG of proofreading and correct first image and obtain second image.First image is switched to second image, and shows second image.
According to one embodiment of present invention, provide a kind of method for displaying image.In this method for displaying image, show first image.Set the desired area of first image.Determine the minimum value and the maximum of the brightness degree that this is regional.The input-output characteristic that change is limited by the minimum value and the maximum of brightness degree is with the GTG of proofreading and correct first image and obtain second image.First image is switched to second image, and shows second image.
According to one embodiment of present invention, provide a kind of image display device.This image display device comprises display part, brightness degree determining section, gray scale correction part and display control section.The intensity map that the display part shows first image and represents the brightness degree distribution of first image.The brightness degree determining section is determined first brightness degree and second brightness degree selected on intensity map.Second brightness degree is higher than first brightness degree.Gray scale correction partly changes the input-output characteristic that is limited by first brightness degree and second brightness degree, with the GTG of proofreading and correct first image and obtain second image.Display control section control is from showing that first image switching is to showing second image.。
According to one embodiment of present invention, provide a kind of image display device.This image display device comprises display part, brightness degree determining section, gray scale correction part and display control section.The display part shows first image.The brightness degree determining section is determined minimum value and the maximum at the brightness degree in the zone of first image setting.Gray scale correction partly changes the input-output characteristic that is limited by the minimum value of brightness degree and maximum, with the GTG of proofreading and correct first image and obtain second image.Display control section control is from showing that in this display part first image switching is to showing second image in this display part.
According to one embodiment of present invention, provide a kind of imaging device.This imaging device comprises imaging moiety, display part, brightness degree determining section, gray scale correction part and display control section.The display part shows the intensity map that first image that imaging moiety is caught and the brightness degree of representing first image distribute.The brightness degree determining section is determined selected first brightness degree and second brightness degree on the intensity map.Second brightness degree is higher than first brightness degree.Gray scale correction partly changes the input-output characteristic that is limited by first brightness degree and second brightness degree, with the GTG of proofreading and correct first image and obtain second image.Display control section control is from showing that in this display part first image switching is to showing second image in this display part.
According to one embodiment of present invention, can easily on intensity map, select wherein to change the zone of the dynamic range of the image that shows.Can be corresponding to selected area change GTG transfer characteristic.In addition, corresponding to GTG transfer characteristic, image is carried out gray scale correction handle through changing.Can be on the display part the reformed image of display dynamic range.
According to the detailed description of following embodiment to optimization model of the present invention, it is more obvious that these and other purposes, features and advantages of the present invention will become, as shown in the drawing.
Description of drawings
Fig. 1 illustrates the block diagram of the structure of imaging device according to an embodiment of the invention;
Fig. 2 illustrates the block diagram of the detailed structure of LCD signal processing according to an embodiment of the invention;
Fig. 3 describes the schematic diagram that is presented at the initial screen on the LCD;
Fig. 4 illustrates the schematic diagram that shows histogrammic LCD on it;
Fig. 5 is illustrated in the schematic diagram that starting point is provided with the example screens that LCD upward shows in the pattern;
Fig. 6 is illustrated in the schematic diagram that terminal point is provided with the example screens that LCD upward shows in the pattern;
Fig. 7 is the schematic diagram that is illustrated in the example screens that LCD upward shows in the affirmation mode;
Fig. 8 A and Fig. 8 B are the figure that describes the processing example that changes gamma table;
Fig. 9 A and Fig. 9 B are the figure that describes the example that changes dynamic range;
Figure 10 A and Figure 10 B are the figure that illustrates corresponding to the accumulation pixel quantity of brightness degree;
Figure 11 A and Figure 11 B describe the figure that automatic setting wherein changes the zone of dynamic range;
Figure 12 A and Figure 12 B describe to utilize the accumulation pixel quantity to determine wherein to change the starting point in zone of dynamic range and the figure of terminal point;
Figure 13 illustrates the schematic diagram that LCD goes up another example of the image that shows;
Figure 14 illustrates the schematic diagram that can select the LCD of regional designated mode thereon;
Figure 15 is the schematic diagram that the LCD in the regional designated mode is shown;
Figure 16 is the schematic diagram that the LCD in the affirmation mode is shown;
Figure 17 A and Figure 17 B are the figure that describes another example of the processing that changes gamma table;
Figure 18 is a schematic diagram of describing the example of the image that display dynamic range changed;
Figure 19 illustrates the flow chart of the processing of imaging device according to an embodiment of the invention.
Embodiment
Next embodiments of the invention will be described with reference to the drawings.In this embodiment, a kind of imaging device will be described.
Fig. 1 illustrates the structure according to the imaging device of this embodiment.This imaging device is by Reference numeral 1 expression.Imaging device 1 comprises imageing sensor 2, analog part 3, Digital Signal Processing part 4, LCD drive circuit 5, LCD 6, CPU 10, Electrically Erasable Read Only Memory (EEPROM) 11, memory 12, operation part 13 and driver 14.Digital Signal Processing part 4 comprises camera signal processing section 15, LCD signal processing 16, outside output interface (I/F) 17, memory card interface 18 and outer input interface (I/F) 19.Reference numeral 17 expressions place the outside lead-out terminal of the shell of imaging device 1.Reference numeral 19 expressions place external input terminals of the shell of imaging device 1.Reference numeral 18 expressions can be connected and dismountable storage card with imaging device 1.
Next will describe the various piece of imaging device 1 in detail.Imageing sensor 2 as the imaging moiety example is made up of for example charge-coupled device (CCD) or complementary metal oxide semiconductors (CMOS) (CMOS).Imageing sensor 2 produces electric analoging signal corresponding to the quantity of incident light.When in case of necessity, carry out interpolation for the analog signal that is generated and handle or the like.Handled analog signal is provided for analog part 3.
For the analog signal that provides, analog part 3 is carried out the correlated double sampling, and (correlated double sample, CDS) processing, automatic gain control (AGC) are handled or the like.Carry out CDS and handle, be used for removing the replacement noise from the analog signal that provides.Carry out AGC and handle, the signal level that the analog signal that will provide is provided is controlled to be steady state value.The analog signal of handling is provided for modulus (A/D) conversion portion (not shown).This A/D conversion portion is a digital signal with analog-signal transitions.Digital signal is provided for Digital Signal Processing part 4.
Digital Signal Processing part 4 is constructed to for example digital signal processor (DSP).The camera signal processing section 15 of Digital Signal Processing part 4 is carried out white balance and is handled and Digital Signal Processing, for example proofreaies and correct (shading correction) for the spot of the digital signal that provides.In case of necessity, camera signal processing section 15 is carried out compression/decompression processes according to associating picture experts group (JPEG) system etc. for the digital signal that provides.
Depend on the processing that 4 pairs of digital signals of Digital Signal Processing part are carried out, the digital signal of 15 outputs is provided to LCD signal processing 16, outside output interface 17 and memory card interface 18 from the camera signal processing section.
LCD drive circuit 5 comprises for example data line drive circuit and gate line drive circuit (it is not shown).The grid impulse corresponding to the control signal that provides from LCD signal processing 16 is provided for data line drive circuit and gate line drive circuit, and selects predetermined pixel.Predetermined voltage is provided to selected pixel.The result is to have connected the thin-film transistor (TFT) of pixel.Therefore image is presented on the LCD 6.
Can show the image that is stored in the memory 12 that is arranged in imaging device 1, the image that is stored in storage card 8 and the image by outer input interface 19 inputs as the LCD 6 of the part of display part.In addition, but LCD 6 display menu screen and histograms, and the brightness degree that this histogram table is shown in the image that shows on the LCD 6 distributes.These images comprise live image and still image.The image that is presented on the LCD 6 is next selected by CPU 10 controls, and CPU 10 is parts of display control section.
In this embodiment, LCD 6 has following display characteristic, and its light transmission increases and increases along with the liquid crystal drive voltage that puts on each pixel.
Outside output interface 17 has the function that is connected with the personal computer that is connected in imaging device 1, printer etc.The digital signal transition that outside output interface 17 will provide from camera signal processing section 15 is the digital signal with predetermined format.The digital signal that changes predetermined format into is sent to the external equipment that is connected in imaging device 1 from outside lead-out terminal 7.
Be provided for outer input interface 19 from the input signal of external input terminals 9 inputs.Outer input interface 19 is converted to input signal the signal with predetermined format.Signal after this transformation is provided for for example camera signal processing section 15.Camera signal processing section 15 is carried out prearranged signal for the signal that is provided and is handled.
In addition, CPU 10 detects the luminance signal that is provided to LCD signal processing 16 from camera signal processing section 15.CPU 10 distributes based on the brightness degree of the luminance signal calculated example that is detected as the presumptive area of a screen image in a frame period.The histogram that the brightness degree that CPU 10 establishment expressions are calculated distributes.In this embodiment, the GTG that is presented at the image on the LCD 6 is formed by 8.Therefore, the brightness degree of the pixel of image is distributed in from 0 to 255 scope.CPU 10 calculates the number of pixels of each grade in 256 brightness degrees.
As will be described, when the point of wishing on the histogram on being presented at LCD 6 is pressed, the brightness degrees of determining corresponding to pressing position as the CPU 10 of the example of brightness degree determining section.
The EEPROM 11 that is connected in Digital Signal Processing part 4 has stored and has been used for the data that processing is carried out in camera signal processing section 15.For example, camera processing adjustment data have been stored among the EEPROM 11.
Memory 12 is by being built in the imaging device 1, and for can rewrite memory, for example the memory of random-access memory (ram) is formed.The section data that produces in the processing of memory 12 as 4 execution of interim storage Digital Signal Processing part, and the section data of storing the image of taking.Certainly, the specialized hardware driver (HDD) of the data of the image taken of storage can be built in the imaging device 1.
The operation part that operation part 13 is made up of the button of the shell that is arranged in imaging device 1, dial etc.Operation signal corresponding to button press operation and the generation of dial rotation amount is provided for CPU10.The processing that CPU 10 carries out corresponding to the operation signal that provides.
The signal that signal processing 3 and Digital Signal Processing part 4 are handled be exported and also not simulated to imaging device 1 can will from imageing sensor 2, promptly original data storage is in storage card 8 and memory 12.
Another structure can be added in the imaging device 1.Imaging device 1 can be equipped with for example communications portion.This communications portion can be passed through the network download view data, and the view data of being downloaded is provided to camera signal processing section 15.
Next will describe the structure of LCD signal processing 16 in detail.In Fig. 2, the example of the summary structure of the box indicating LCD signal processing 16 of surrounding by dotted line.LCD signal processing 16 comprises gain adjustment member 16a, gain/colour correction part 16b, matrix part 16c and gamma correction part 16d, and gamma correction part 16d is an example of gray scale correction part.
The signal that is divided into luminance signal (Y-signal) and color difference signal (Cr/Cb signal) for example is provided to LCD signal processing 16 from camera signal processing section 15.Gain adjustment member 16a proofreaies and correct the gain of the luminance signal that offers LCD signal processing 16 to adjust signal level.Luminance signal after the gain calibration is provided to matrix part 16c.
In LCD signal processing 16, color difference signal is provided among gain/colour correction part 16b.LCD signal processing 16 is carried out gain calibration for color difference signal to adjust signal level.In addition, LCD signal processing 16 is carried out colour correction for color difference signal to proofread and correct its colourity (chroma) and form and aspect (hue).The color difference signal of calibrated gain and correction color is provided for matrix part 16c.
Gamma correction is handled by this way and is carried out, and promptly digital signal is transfused to as the address of the question blank of gamma correction part 16d, and the data that write at the place, address corresponding to incoming level are read out as output signal.Under the control of CPU 10, can rewrite and be used for the gamma table that gamma correction is handled.The result is freely to change the GTG transfer characteristic.The gamma correction primary signal is provided to LCD drive circuit 5 from LCD signal processing 16.
Be used for correction coefficient that aforementioned gain calibration processing and colour correction handle etc. following of the control of CPU 10 and be set at suitable value.When the user push with image overlay and when being presented at the point of wishing on the histogram on the LCD 6, detect the position (hereinafter, being sometimes referred to as touch location) of pushing by position detection part 21.Touch location is defined as the address information of the position pixel of for example pushing on LCD 6.The touch location that position detection part 21 is detected is provided for CPU 10.As will be described, CPU10 is based on the information creating question blank of touch location and set new gamma table.The position probing of position detection part 21 is handled and can be carried out by CPU 10.
Next the operation example of imaging device 1 will be described.Fig. 3 is the example that is presented at the screen on the LCD 6 according to this embodiment.As shown in Figure 3, the viewing area of LCD 6 is divided into a plurality of zones.In the zone of Reference numeral 24 expression, as an example of first image and be stored in storage card 8 or memory 12 in image P1 (in the accompanying drawings, image P1 is shown as the image in house) be read out and show.Hereinafter, this zone is called image display area 24 sometimes.
In the zone of Reference numeral 25 expressions, show the key that is used to carry out each function.Hereinafter, this zone is sometimes referred to as operating area 25.In this embodiment, stop key 25a, be used for reproducing and the reproduction key 25b of display image, be used to select and the options button 25c of display image and 25d, Pause key 25e and histogram key 26 are presented at operating area 25.Hereinafter, screen shown in Figure 3 is sometimes referred to as initial screen.
When pushing histogram key 26, corresponding information is provided to CPU10 by position detection part 21.When having pushed histogram key 26, CPU 10 recognizes that having set dynamic range changes pattern, changes the dynamic range of display image P1 in this pattern.Difference between dynamic range ordinary representation maximum and the minimum value.The dynamic range of the image that shows represents to be presented at the dynamic range of the image on the LCD 6.
When having set dynamic range change pattern, CPU 10 carries out the processing of the distribution of calculating brightness degrees.For example, the distribution of the brightness degree of the luminance signals of CPU 10 detection 15 outputs and computed image P1 from the camera signal processing section.The histogram of the distribution of the brightness degree that expression CPU 10 calculates is created.
The histogrammic data that LCD signal processing 16 will be created and image P1 stack and by LCD drive circuit 5 image that display result obtains on LCD 6.
Fig. 4 illustrates the example of the LCD 6 that shows histogram H1.As shown in Figure 4, the histogram H1 of the brightness degree of presentation video P1 distribution is displayed in the presumptive area of operating area 25.The trunnion axis of histogram H1 is represented brightness degree 0 to 255, and vertical axis is represented the number corresponding to the pixel of brightness degree.
According to one embodiment of present invention, utilize the histogram that shows on the LCD 6, the dynamic range that is presented at the image on the image display area 24 can easily change.Like this, even object is taken under the low-light level environment, and dark image is displayed in the image display area 24, but utilizes histogram, can change the dynamic range of image.The altered image of dynamic range can be presented on the LCD 6.The situation that increases dynamic range will be described in the following description.
When histogram H1 was presented on the LCD 6, the screen of LCD 6 was changed into the screen that the starting point shown in Fig. 5 is provided with pattern.Be provided with in the pattern in starting point, the message 27 of expression " selecting starting point on histogram " is presented in the operating area 25.Corresponding to information 27, by pushing the point of wishing on the histogram, the user sets the starting point in the zone that wherein increases dynamic range.For example, near the left end with the concentrated zone of the last brightness degree of user's finger touch histogram H1, he or she sets starting point.
As shown in Figure 5, after starting point had been set, the dotted line of expression starting point was presented on the histogram H1.At this some place, the positional information that the expression users point 29 positions that touch (X, Y) (X wherein, Y represent the coordinate in the viewing area among the histogram H1) detected in position detection part 21.The positional information that has detected is provided for CPU 10.(X, X Y) calculate brightness degree D (S) as first brightness degree to CPU 10 corresponding to the positional information that is provided.The brightness degree D (S) of this calculating is stored among the RAM of CPU 10 temporarily.
After having set starting point, be presented at screen on the LCD 6 and change into terminal point shown in Figure 6 the pattern screen is set.Be provided with in the pattern at terminal point, the information 30 of expression " selecting terminal point on histogram " is presented in the operating area 25.Corresponding to information 30, go up the point of wishing by pushing histogram H1, the user sets increases the wherein terminal point in the zone of dynamic range.For example, push near the right-hand member that histogram H1 goes up the zone that brightness degree concentrates by point 29 with the user, he or she has set this terminal point.
After terminal point had been set, the dotted line of expression terminal point was presented on the histogram H1.At this some place, the positional information that the expression users point 29 positions that touch (X ', Y ') (wherein X ', the coordinate in the viewing area of Y ' expression histogram H1) is detected in position detection part 21.The positional information that is detected is provided for CPU 10.CPU 10 calculates brightness degree D (E) as second brightness degree (wherein D (S)＜D (E)) corresponding to the X ' of the positional information that provides (X ', Y ').The brightness degree D (E) of this calculating is stored among the RAM of CPU 10 temporarily.
After having set starting point and terminal point on histogram H1, the screen of LCD 6 is changed into affirmation pattern screen shown in Figure 7.On affirmation pattern screen shown in Figure 7, demonstrate expression " you confirm to change dynamic range? " information 33, whether its inquiry user will change the dynamic range in the zone of having set on histogram H1.In addition, YES key 31 and the NO key 32 corresponding to this information 33 also is shown.At this some place, when pushing NO key 32, the screen of LCD 6 is changed into starting point shown in Figure 5 the pattern screen is set.Certainly, the screen of LCD 6 can be changed into and be different from another screen that starting point is provided with the pattern screen.
During YES key 31 on pushing the screen shown in Fig. 7, CPU 10 rewrites and is stored in the gamma table among the gamma correction part 16d and creates question blank.
Fig. 8 A and Fig. 8 B illustrate an example of the processing that rewrites gamma table.In this example, for simplicity, suppose that the signal that is input among the gamma correction part 16d has linear I/O characteristic (hereinafter, this signal is known as input signal sometimes).
Fig. 8 A shows the gamma table GT1 that is stored among the gamma correction part 16d.Input on the trunnion axis of gamma table GT1 is corresponding to the brightness degree of the luminance signal that is input to gamma correction part 16d, and the output of vertical axis is corresponding to liquid crystal drive voltage, and this liquid crystal drive voltage is exported corresponding to the brightness degree of input luminance signal.Liquid crystal drive voltage represents to put on the size of voltage of each pixel of LCD 6.
Gamma table GT1 makes the big or small linear correlation of brightness degree and liquid crystal drive voltage.Therefore, when brightness degree increased, the size of liquid crystal drive voltage increased.Along with the size increase of liquid crystal drive voltage, the light transmission of LCD6 increases, and the brightness that is presented at the image on the LCD 6 thus increases.
As mentioned above, when the zone of the dynamic range of the image that wherein utilizes histogram H1 increase to show was designated, shown in Fig. 8 B, gamma table GT1 was rewritten as gamma table GT2.In gamma table GT2, between brightness degree D (S) and brightness degree D (E), change linearly as the liquid crystal drive voltage of exporting.When brightness degree becomes D (S),, be 0 so be equal to or less than that the brightness degree of the D (S) of the pixel of image P1 is changed because liquid crystal display voltage is 0.In other words, brightness degree D (S) becomes the maximum of brightness degree of minimum value of the dynamic range of the image P1 that is converted into demonstration.
When brightness degree increased to D (E), the corresponding liquid crystal driving voltage became maximum.Maximum liquid crystal drive voltage for example is approximately 5V, although it depends on characteristic of liquid crystal or the like.Therefore, to be changed be 255 to the brightness degree that surpasses the pixel of D (E).In other words, brightness degree D (E) becomes the minimum value of peaked brightness degree of the dynamic range of the image P1 that is converted into demonstration.
Because gamma table GT1 has been rewritten as gamma table GT2 by this way, thus from the brightness degree D (S) of appointment to the zone of D (E), can increase the dynamic range of the image P1 of demonstration.
Utilize the gamma table GT2 that rewrites that image P1 is carried out gamma correction.The predetermined liquid crystal drive voltage of gamma correction part 16d output.The data line drive circuit of LCD drive circuit 5 and gate line drive circuit make the new images (second image) that comes from image P1 transformation be presented on the LCD 6 corresponding to the liquid crystal drive voltage operation of output.At this moment, histogram H1 can still be presented in the operating area 25.The histogram that alternately, can show the Luminance Distribution of representing this new images.
In this way, can easily increase the dynamic range of shown image in the image display area 24 of LCD 6 by shirtsleeve operation.
Next another example of utilizing histogram to set the zone that wherein changes dynamic range will be described.When the image modification in the image display area 24 that is presented at LCD 6, the histogram that the brightness degree of presentation video distributes changes.In this example, about the zone of having set, automatically set gamma table once more corresponding to the image (the 3rd image) that shows recently.
Fig. 9 A illustrates a histogrammic example, wherein, has utilized the histogram H2 of Luminance Distribution of the pixel of expression specific image (first image) to set the starting point and the terminal point in the zone that wherein increases dynamic range.On histogram H2, the brightness degree of image pixel is distributed in 80 to 240 the zone.Suppose,, set brightness degree 90,, set brightness degree 230 as example corresponding to second brightness degree of the terminal point in zone as example corresponding to first brightness degree of the starting point in zone.In addition, suppose that under the situation of the gamma correction of the dynamic range that does not increase the zone of having set, the image that is presented in the image display area 24 is changed.By gamma correction image (second image) be displayed in the image display area 24 after, when image modification is carried out identical processing when being new image (the 3rd image).
Shown in Fig. 9 B,, increase the dynamic range of the image that shows from the zone of brightness degree 90 to 230.On the other hand, another hatched area of the hatched area of brightness degree 80 to 90 and brightness degree from 230 to 240, the pixel of image becomes saturated black (minimum value black) or saturated white (maximum white).
Figure 34 shown in Figure 10 A and Figure 10 B is that the number of pixels of each brightness degree of representing corresponding to histogram H2 is by the figure of accumulative total.On figure 34,, illustrate with line simply for easy understanding.On figure 34, trunnion axis is represented brightness degree, and vertical axis is represented the number of pixels corresponding to brightness degree accumulative total.On histogram H2, not having brightness degree is pixel below 80 or 80.Therefore, brightness degree be 80 or the number of lower pixel accumulative total be 0.In addition, not have brightness degree be 240 or be higher than 240 pixel.Therefore, brightness degree is the total number of the accumulative total number N of 240 pixel corresponding to the pixel of the image in the image display area 24 that is presented at LCD 6.
Histogram H3 shown in Figure 11 A is owing to the image in the image display area 24 that is presented at LCD 6 has been changed into new image (the 3rd image), and newly is presented at the histogrammic example in the operating area 25.Suppose that on histogram H3 the brightness degree of pixel is distributed in 0 to 220 the zone.When showing histogram H3, in histogram H3, automatically set the zone that wherein increases dynamic range.In other words, as shown in Figure 11 B, automatically set corresponding to the brightness degree R (S) of starting point and corresponding to the brightness degree R (E) of terminal point.
Next an example of the method for setting brightness degree R (S) and R (E) will be described.Figure 35 shown in Figure 12 A and Figure 12 B is accumulative total figure corresponding to the number of the pixel of each brightness degree of histogram H3.At first, shown in Figure 12 A, determine brightness degree corresponding to pixel accumulative total number H (S).Determined brightness degree is called as brightness degree R (S) and is designated as the 3rd brightness degree corresponding to the starting point in the zone of automatic setting on histogram H3.
Next, shown in Figure 12 B, determine brightness degree R (E) corresponding to pixel accumulative total number H (E).For example, pixel accumulative total number is counted to H (E) from 0.After the counting number of pixels, determine corresponding brightness degree.The brightness degree that should determine is called brightness degree R (E), and is designated as the 4th brightness degree corresponding to the terminal point in the zone of automatic setting on histogram H3.
At this some place, it is that the number of R (S) or the pixel that is lower than R (S) is identical that the number that the brightness degree of first image is equal to or less than 90 pixel almost becomes with the brightness degree of the 3rd image.In addition, almost to become with the brightness degree of the 3rd image be that the number of R (E) or the pixel that is higher than R (E) is identical to the brightness degree of first image number that is equal to or higher than 230 pixel.Like this, when on LCD 6, showing new image, when becoming saturated black or saturated white number of pixels and remain unchanged, can automatic setting brightness degree R (S) and brightness degree R (E).Like this, when showing new image on LCD 6, the user there is no need to specify the wherein reformed zone of dynamic range.Certainly, the user can change wherein the zone of automatic setting dynamic range.
Next will describe an example, wherein the image about showing in the image display area 24 is set the zone that wherein changes the dynamic range of the image that will show.For example, suppose that brightness degree as shown in figure 13 changes to 255 image P2 from 0 gradually and is presented on the LCD 6.For convenience, image P2 has been divided into rectangular area 50 to 63.In addition, the histogram H4 of the brightness degree of various types of operation keys 25a to 25e, histogram key 26 and presentation video P2 distribution is presented in the operating area 25 of LCD 6.
When state shown in Figure 13 is pushed histogram key 26, think that then dynamic range change pattern occurs.The result is that the screen that is presented on the LCD 6 becomes screen shown in Figure 14.As shown in figure 14, retainingf key 36, key interlock 37 and regional assignment key 38 newly are presented in the operating area 25.When retainingf key 36 was pressed, dynamic range changed regional designated mode and occurs.Change in the regional designated mode in dynamic range, by touching histogram H4, the dynamic range that can set the dynamic range of the image that wherein changes will show changes regional.When key interlock 37 was pressed, the interlocking pattern occurred.In the interlocking pattern, to describe as earlier examples, the dynamic range of having set changes the zone and is applied to another image.When regional assignment key 38 was pressed, regional designated mode occurred.In regional designated mode, the screen that shows on the LCD 6 is changed into screen shown in Figure 15.
In regional designated mode, as shown in figure 15, the information 39 of expression " appointed area " is presented in the operating area 25.Corresponding to information 39, the user specifies the dynamic range of the dynamic range that wherein changes the image that will show to change the zone.In this example, go up the point of wishing by pressing image P2, the user can the appointed area.
Suppose and change into black or be close to dynamic range that the user pushes and comprises zone 57 to 63 and 4 points that represent with Reference numeral a to d, to specify this zone for zone 57 to the zone 63 of black.In this example, the zone is by 4 appointments.On the other hand, the zone can be by 3 appointments.
When appointed area, the screen that is presented on the LCD 6 is changed into the affirmation pattern screen shown in Figure 16.As shown in figure 16, framework 43 has been illustrated specified zone.In addition, the expression " you be sure of to change dynamic range? " information 40 be presented in the operating area 25.YES key 42 and NO key 42 corresponding to information 40 are shown.When NO key 42 was pressed, the screen that is presented on the LCD 6 for example became the screen shown in Figure 13.
When YES key 41 is pressed, rewrites the gamma table that is stored among the gamma correction part 16d, and utilize it to create question blank.Carry out the processing of the dynamic range that changes the image P2 that will show.For example change the dynamic range of the image P2 that will show in the following manner.
Figure 17 A and 17B illustrate an example of the processing that writes gamma table again.For example, suppose, the gamma table GT3 of brightness degree (input) and liquid crystal drive voltage (output) characteristic linear correlation has been stored in the LCD signal processing 16, as shown in Figure 17 A.CPU 10 carries out the processing that gamma table GT3 is rewritten as the gamma table GT4 shown in Figure 17 B.In other words, rewrite gamma table, make that liquid crystal drive voltage changes linearly between the minimum value 0 of brightness degree and maximum.
At this moment, brightness degree 0 is the maximum of brightness degree of minimum value of dynamic range that is converted into the image of demonstration.On the other hand, brightness degree 100 is the minimum values of peaked brightness degree that are converted into the dynamic range of demonstration.By gamma table being rewritten as gamma table GT4, can be increased in the dynamic range of the image that from the zone of brightness degree 0 to 100, shows.
Utilize gamma table GT4, carry out gamma correction and handle.Figure 18 illustrates image P3, and image P3 is the image P2 that is crossed by gamma correction, and image P3 is an example that is presented at the 4th image on the LCD 6.In image P3, appointed regional 57 contrasts to zone 63 are enhanced, and the dynamic range of the image that shows is increased.On the other hand, the brightness degree of zone 50 to zone 56 (by 64 expressions of Reference numeral among Figure 18) is 255.Therefore, by pushing the point of wishing in the image in the image display area 24 that is presented at LCD 6, a zone is designated, and the dynamic range of this appointed area can be changed.
Figure 19 shows the flow chart of the processing of imaging device 1 according to an embodiment of the invention.For example by CPU 10 these processing of following control.
In step S1, determine whether to select and push the histogram key 26 that is presented on the LCD 6.When step S1 does not also select histogram key 26, flow process advances to step S2.
In step S2, determine whether to select and push another project key.When not selecting at step S2 and pushing another project, flow process is got back to step S1.In step S1, determine whether to push histogram key 26.When having selected at step S2 and having pushed another project key, flow process advances to step S3.At step S3, carry out processing corresponding to the key of selecting at step S2.
When step S1 has selected and push histogram key 26, flow process advances to step S4.In step S4, CPU 10 determines that histogram key 26 has been pressed and it is selected to confirm that dynamic range changes pattern.After this, flow process advances to step S5.
In step S5, the screen that is presented on the LCD 6 becomes dynamic change pattern screen.In other words, in step S5, the histogram that expression is presented at the Luminance Distribution of the image in the operating area 25 is shown.Being presented at screen on the LCD 6 becomes starting point the pattern screen is set.After this, flow process advances to step S6.
In step S6, determine that position that the user pushes is whether on LCD 6 in the shown histogrammic zone.When this position was not in this zone, flow process advanced to step S7.
In step S7, determined whether to push the return key of getting back to initial screen.When having pushed return key, flow process turns back to step S1.In step S1, the screen that is presented on the LCD 6 becomes initial screen.When not pushing return key, flow process is got back to step S6.In step S6, determine that position that the user pushes is whether in histogrammic zone.
When the position of being pushed step S6 user was in histogrammic zone, flow process advanced to step S8.In step S8, according to the brightness degree D (S) of the position calculation of in step S6, pushing corresponding to starting point.CPU 10 is based on the information calculations brightness degree D (S) that provides from for example position detection part 21.After this, flow process advances to step S9.
Owing to set starting point, in step, screen becomes terminal point the pattern screen is set.After this, flow process advances to step S10.
In step S10, determine that the position of pushing is whether in histogrammic zone in step S10.When the position of pushing among the step S10 was outside histogrammic zone, flow process advanced to S11.
In step S11, determine whether to have pushed return key.When having pushed return key, flow process is got back to step S1 again.In step S1, the screen that is presented on the LCD 6 becomes initial screen.When return key was not pressed, flow process was got back to step S10.In step S10, determine that the position of pushing is whether in histogrammic zone in step S6.
When the position of being pushed among the step S10 was in histogrammic zone, flow process advanced to step S12.In step S12, based on the brightness degree D (E) of the position calculation of pushing among the step S10 corresponding to terminal point.For example, CPU 10 is based on the information calculations brightness degree D (E) that provides from for example position detection part 21.After this, flow process advances to step S13.
At step S13, the screen that is presented on the LCD 6 becomes the affirmation mode screen.On the affirmation mode screen, YES key and NO key are presented in the operating area 25 of LCD 6, and the user uses them to confirm to change dynamic range in the zone that he or she has set.After this, flow process advances to step S14.
In step S14, determined whether to push YES key to confirm the change of dynamic range.When having pushed the NO key, flow process is got back to step S6.In step S6, set histogrammic starting point and terminal point.In this case, flow process can turn back to step S1 rather than step S6.When having pushed YES key, flow process advances to step S15.
In step S15, rewrite the gamma table that is stored among the gamma correction part 16d, and create question blank thus.For example, CPU 10 rewrites gamma table, so that the dynamic range that shows increasing from brightness degree D (S) to the zone of brightness degree D (E), brightness degree D (S) and brightness degree D (E) are corresponding to starting point of having set and terminal point.After rewriteeing gamma table, flow process advances to step S16.
In step S16, utilize the gamma table of new settings, gamma correction part 16d carries out gamma correction to picture signal.Picture signal through gamma correction is provided to LCD drive circuit 5 from gamma correction part 16d.After this, flow process advances to step S17.
In step S17, form the data line drive circuit of LCD drive circuit 6 and the fixed cycle operator that gate line drive circuit is being scheduled to.After this, be presented at another screen that screen on the LCD 6 becomes the image that shows that its dynamic range has been increased.
In the foregoing embodiments, be chosen on the histogram brightness degree corresponding to starting point and terminal point.Alternatively, can select one of starting point on the histogram and terminal point.For example, brightness degree can be fixed, and brightness degree can be selected corresponding to terminal point corresponding to starting point.
In the foregoing embodiments, as an example of imaging device 1, used video tape recorder.Yet one embodiment of the present of invention can be applicable to digital camera, have the mobile phone and the PDA(Personal Digital Assistant) of camera function.In addition, one embodiment of the present of invention can be applicable to have and show that institute stores in (record) image or the image display device of the image function by the acquisition of the network on the display part in HDD, semiconductor memory or CD.
The display part is not limited to LCD.Alternately, the display part can be made up of the display device of another kind of type, for example cathode ray tube (CRT), Plasmia indicating panel (PDP) or organic electroluminescence panel.The position of the position of operation keys and type and display image only is an example on the LCD 6.Therefore, they are not limited to these examples.
According to aforesaid embodiment, as an example representing the intensity map that brightness degree distributes, histogram is as an illustration.Alternately, the legend of another kind of type such as block diagram also can use.
According to aforesaid embodiment, each processing of forming imaging device can the special hardware circuit structure.Alternately, each processing can be finished by the computer of a method or a programming.The program of each content of handling of wherein having encoded can be recorded to computer readable recording medium storing program for performing, for example in magnetic recording equipment, CD, magneto optical disk or the semiconductor memory.
Those skilled in the art should understand that and can carry out various modifications, combination, inferior combination and change according to design needs and other factors, they still be included in appended claim and the scope that is equal within.
The present invention includes the theme of the Japanese patent application JP2006-043970 that relates on February 21st, 2006 and submit in Japan Patent office, be incorporated herein by reference in its entirety.
Claims (10)
1, a kind of method for displaying image comprises the steps:
Show first image;
The intensity map that shows the brightness degree distribution of expression first image;
Select first brightness degree and second brightness degree on intensity map, second brightness degree is higher than first brightness degree;
Proofread and correct the GTG of first image by changing the input-output characteristic that limits by first brightness degree and second brightness degree, so that obtain second image; And
From showing that first image switching is to showing second image.
2, according to the method for displaying image of claim 1,
Wherein, among the brightness degree of first image, first brightness degree is the maximum of brightness degree of minimum value that is converted into the dynamic range of demonstration, and
Wherein, among the brightness degree of first image, second brightness degree is the minimum value of peaked brightness degree that is converted into the dynamic range of demonstration.
3, according to the method for displaying image of claim 1, also comprise the steps:
Show the 3rd image that is different from first image and second image;
Another intensity map that shows the brightness degree distribution of expression the 3rd image; And
Set the 3rd brightness degree and the 4th brightness degree on this another intensity map, the 4th brightness degree is higher than the 3rd brightness degree,
Wherein, in this set step, the brightness degree of first image is equal to or less than the number of pixel of first brightness degree, and almost to be equal to or less than the number of pixel of the 3rd brightness degree identical with the brightness degree of the 3rd image, and
Wherein, the brightness degree of first image is equal to or higher than the number of pixel of second brightness degree almost to be equal to or higher than the number of pixel of the 4th brightness degree identical with the brightness degree of the 3rd image.
4, according to the method for displaying image of claim 3, also comprise the steps:
Proofread and correct the GTG of the 3rd image by changing the input-output characteristic that limits by the 3rd brightness degree and the 4th brightness degree, so that obtain the 4th image, and
From showing that the 3rd image switching is to showing the 4th image.
5, according to the method for displaying image of claim 3 or claim 4,
Wherein, among the brightness degree of the 3rd image, the 3rd brightness degree is the maximum of brightness degree of minimum value that is converted into the dynamic range of demonstration, and
Wherein, in the brightness degree of the 3rd image, the 4th brightness degree is the minimum value of peaked brightness degree that is converted into the dynamic range of demonstration.
6, a kind of method for displaying image comprises the steps:
Show first image;
Set the desired area of first image;
Determine the minimum value and the maximum of the brightness degree that this is regional;
Proofread and correct the GTG of first image by the input-output characteristic that minimum value and the maximum that changes by brightness degree limits, so that obtain second image; And
From showing that first image switching is to showing second image.
7, according to the method for displaying image of claim 6,
Wherein, among the brightness degree of first image, the minimum value of brightness degree is the maximum of brightness degree of minimum value that is converted into the dynamic range of demonstration, and
Wherein, among the brightness degree of first image, the maximum of brightness degree is the minimum value of peaked brightness degree that is converted into the dynamic range of demonstration.
8, a kind of image display device comprises:
The display part, the intensity map that it shows first image and represents the brightness degree distribution of first image;
The brightness degree determining section, it determines first brightness degree and second brightness degree selected on intensity map, second brightness degree is higher than first brightness degree;
The gray scale correction part, it changes the input-output characteristic that is limited by first brightness degree and second brightness degree, with the GTG of proofreading and correct first image and obtain second image; And
Display control section, it is from showing that first image switching is to showing second image.
9, a kind of image display device comprises:
The display part, it shows first image;
The brightness degree determining section, it determines minimum value and maximum at the brightness degree in the zone of first image setting;
The gray scale correction part, it changes the input-output characteristic that minimum value and maximum by brightness degree limit, with the GTG of proofreading and correct first image and obtain second image; And
Display control section, it is from showing that in this display part first image switching is to showing second image in this display part.
10, a kind of imaging device comprises:
Imaging moiety;
The display part, it shows the intensity map that first image that imaging moiety is caught and the brightness degree of representing first image distribute;
The brightness degree determining section, it determines selected first brightness degree and second brightness degree on the intensity map, second brightness degree is higher than first brightness degree;
The gray scale correction part, it changes the input-output characteristic that is limited by first brightness degree and second brightness degree, with the GTG of proofreading and correct first image and obtain second image; And
Display control section, it is from showing that in this display part first image switching is to showing second image in this display part.
Applications Claiming Priority (2)
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| JP2006043970A JP4325627B2 (en) | 2006-02-21 | 2006-02-21 | Image display method, image display apparatus, and imaging apparatus |
| JP043970/06 | 2006-02-21 |
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| CN101060587A true CN101060587A (en) | 2007-10-24 |
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| EP (1) | EP1821523A3 (en) |
| JP (1) | JP4325627B2 (en) |
| KR (1) | KR20070083430A (en) |
| CN (1) | CN100576879C (en) |
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| CN111787181A (en) * | 2016-02-05 | 2020-10-16 | Nec平台株式会社 | Image data conversion device, image data conversion method, image data conversion program, POS terminal device, and server |
| CN111787181B (en) * | 2016-02-05 | 2022-06-10 | Nec平台株式会社 | Image data conversion device, image data conversion method, image data conversion program, POS terminal device, and server |
| CN109949769A (en) * | 2017-12-11 | 2019-06-28 | 三星显示有限公司 | It is capable of the display device of expansion of gradation |
| CN112954436A (en) * | 2019-11-26 | 2021-06-11 | 西安诺瓦星云科技股份有限公司 | Video image quality adjusting method and device and video processing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007228048A (en) | 2007-09-06 |
| JP4325627B2 (en) | 2009-09-02 |
| TWI377835B (en) | 2012-11-21 |
| CN100576879C (en) | 2009-12-30 |
| US20070206108A1 (en) | 2007-09-06 |
| EP1821523A2 (en) | 2007-08-22 |
| EP1821523A3 (en) | 2011-03-23 |
| TW200737944A (en) | 2007-10-01 |
| KR20070083430A (en) | 2007-08-24 |
| US7986355B2 (en) | 2011-07-26 |
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